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Various cleanups and refactoring.
Removes feedback of active worst qaulity and uses last_q
instead to make the interface cleaner. Active worst quality
is now decided only once for a frame being coded in the
beginning based on last_q and other stats. Also, adds other
cleaups on last_q to store also the last_q for altref frames,
and reduces the altref interval a little.

The output does change a little.
derfraw300: +0.224% (global psnr)
stdhdraw250: +0.442% (global psnr)

Change-Id: Ie634cdc032697044c472dd0fe79c109b3e7f9767

The added vector was encoded with aq mode on, with the intent to
exercise the decode code around segment feature.

Change-Id: Iedcb7261e87d3e11b25ecf031d3a69385271148e

Change-Id: Id677df4d3dbbed6fdf7319ca6464f19cf32c8176

Makes the thresholds for bitrate control more leniant to
prevent test failures.

Change-Id: I535c1565174a8a46493b033531eb40360def883b

Frank Galligan authored Dec 10, 2013 and James Zern committed Dec 15, 2013

Add an option for libvpx to return the least recently used
frame buffer.

Change-Id: I886a96ffb94984f1c42de53086e0131922df3260

VP9 decoder can now use frame buffers passed in by the application.

Change-Id: I599527ec85c577f3f5552831d79a693884fafb73

Change-Id: I617d6c610d181076773c5c3d6f3dbc6717b02580

the nestegg packet was only freed by subsequent reads

Change-Id: Ib687a13907861c7575830783e47a596d85169cf1

Change-Id: I8ae093d0b61d71d3c294b95d98d0178f7f67c8f6

Change-Id: I068345f722a7116e3119927295ad23a28d3066a0

Change-Id: I8b81a3e4b4fa530a654c28d9c136afa0c1d379fd

Change-Id: I44513b9db6d42e2c52723e1a429f06a93d300c8b

Using num_{4x4, 8x8}_blocks_{wide, high}_lookup instead.

Change-Id: I66a7ab807fa57395253b2d0e636c2479fa8c4adf

Change-Id: I7ff2899ea18a55b37f5c581431ef59806f01e009

Increased threshold(t) for interp filter search. This sped up the
encoder with some PSNR loss.

Borg tests were ran at speed 2.
t = 100, PSNR loss:
-0.710%(derf); -0.561%(stdhd); -0.647%(youtube)
speedup:
9%(derf); 3%(stdhd); 5.7%(youtube)

t = 500, PSNR loss:
-1.687%(derf); -1.665%(stdhd); -1.664%(youtube)
speedup:
18%(derf); 10%(stdhd); 8%(youtube)

Change-Id: I180e3657c1e156aaa88dc7c437f8bcbd19f5caba

Corrected a typo that set rc_2pass_vbr_minsection_pct to
two different values on consecutive lines. Second line
should have set rc_2pass_vbr_maxsection_pct.

Change-Id: Ie07ac67cd5455afe556bef34da8127304db9c97c